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tty: serial: qcom_geni_serial: Remove use of *_relaxed() and mb()

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[ Upstream commit 9e06d55f7b856bfaf82036b50072600b21e52d20 ]

A frequent side comment has been to remove the use of writel_relaxed,
readl_relaxed, and mb. This reduces driver complexity and the _relaxed
variants were not known to provide any noticeable performance benefit.

Signed-off-by: Ryan Case <ryandcase@chromium.org>
Reviewed-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ryan Case 2019-01-07 17:58:35 -08:00 committed by Greg Kroah-Hartman
parent 4d1a94fa6d
commit 1cc8834773
1 changed files with 80 additions and 111 deletions
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191
drivers/tty/serial/qcom_geni_serial.c
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@ -226,7 +226,7 @@ static unsigned int qcom_geni_serial_get_mctrl(struct uart_port *uport)
if (uart_console(uport)) {
mctrl |= TIOCM_CTS;
} else {
geni_ios = readl_relaxed(uport->membase + SE_GENI_IOS);
geni_ios = readl(uport->membase + SE_GENI_IOS);
if (!(geni_ios & IO2_DATA_IN))
mctrl |= TIOCM_CTS;
}
@ -244,7 +244,7 @@ static void qcom_geni_serial_set_mctrl(struct uart_port *uport,
if (!(mctrl & TIOCM_RTS))
uart_manual_rfr = UART_MANUAL_RFR_EN | UART_RFR_NOT_READY;
writel_relaxed(uart_manual_rfr, uport->membase + SE_UART_MANUAL_RFR);
writel(uart_manual_rfr, uport->membase + SE_UART_MANUAL_RFR);
}
static const char *qcom_geni_serial_get_type(struct uart_port *uport)
@ -273,9 +273,6 @@ static bool qcom_geni_serial_poll_bit(struct uart_port *uport,
unsigned int fifo_bits;
unsigned long timeout_us = 20000;
/* Ensure polling is not re-ordered before the prior writes/reads */
mb();
if (uport->private_data) {
port = to_dev_port(uport, uport);
baud = port->baud;
@ -295,7 +292,7 @@ static bool qcom_geni_serial_poll_bit(struct uart_port *uport,
*/
timeout_us = DIV_ROUND_UP(timeout_us, 10) * 10;
while (timeout_us) {
reg = readl_relaxed(uport->membase + offset);
reg = readl(uport->membase + offset);
if ((bool)(reg & field) == set)
return true;
udelay(10);
@ -308,7 +305,7 @@ static void qcom_geni_serial_setup_tx(struct uart_port *uport, u32 xmit_size)
{
u32 m_cmd;
writel_relaxed(xmit_size, uport->membase + SE_UART_TX_TRANS_LEN);
writel(xmit_size, uport->membase + SE_UART_TX_TRANS_LEN);
m_cmd = UART_START_TX << M_OPCODE_SHFT;
writel(m_cmd, uport->membase + SE_GENI_M_CMD0);
}
@ -321,13 +318,13 @@ static void qcom_geni_serial_poll_tx_done(struct uart_port *uport)
done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
M_CMD_DONE_EN, true);
if (!done) {
writel_relaxed(M_GENI_CMD_ABORT, uport->membase +
writel(M_GENI_CMD_ABORT, uport->membase +
SE_GENI_M_CMD_CTRL_REG);
irq_clear |= M_CMD_ABORT_EN;
qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
M_CMD_ABORT_EN, true);
}
writel_relaxed(irq_clear, uport->membase + SE_GENI_M_IRQ_CLEAR);
writel(irq_clear, uport->membase + SE_GENI_M_IRQ_CLEAR);
}
static void qcom_geni_serial_abort_rx(struct uart_port *uport)
@ -337,8 +334,8 @@ static void qcom_geni_serial_abort_rx(struct uart_port *uport)
writel(S_GENI_CMD_ABORT, uport->membase + SE_GENI_S_CMD_CTRL_REG);
qcom_geni_serial_poll_bit(uport, SE_GENI_S_CMD_CTRL_REG,
S_GENI_CMD_ABORT, false);
writel_relaxed(irq_clear, uport->membase + SE_GENI_S_IRQ_CLEAR);
writel_relaxed(FORCE_DEFAULT, uport->membase + GENI_FORCE_DEFAULT_REG);
writel(irq_clear, uport->membase + SE_GENI_S_IRQ_CLEAR);
writel(FORCE_DEFAULT, uport->membase + GENI_FORCE_DEFAULT_REG);
}
#ifdef CONFIG_CONSOLE_POLL
@ -347,19 +344,13 @@ static int qcom_geni_serial_get_char(struct uart_port *uport)
u32 rx_fifo;
u32 status;
status = readl_relaxed(uport->membase + SE_GENI_M_IRQ_STATUS);
writel_relaxed(status, uport->membase + SE_GENI_M_IRQ_CLEAR);
status = readl(uport->membase + SE_GENI_M_IRQ_STATUS);
writel(status, uport->membase + SE_GENI_M_IRQ_CLEAR);
status = readl_relaxed(uport->membase + SE_GENI_S_IRQ_STATUS);
writel_relaxed(status, uport->membase + SE_GENI_S_IRQ_CLEAR);
status = readl(uport->membase + SE_GENI_S_IRQ_STATUS);
writel(status, uport->membase + SE_GENI_S_IRQ_CLEAR);
/*
* Ensure the writes to clear interrupts is not re-ordered after
* reading the data.
*/
mb();
status = readl_relaxed(uport->membase + SE_GENI_RX_FIFO_STATUS);
status = readl(uport->membase + SE_GENI_RX_FIFO_STATUS);
if (!(status & RX_FIFO_WC_MSK))
return NO_POLL_CHAR;
@ -372,13 +363,12 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport,
{
struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
writel_relaxed(port->tx_wm, uport->membase + SE_GENI_TX_WATERMARK_REG);
writel(port->tx_wm, uport->membase + SE_GENI_TX_WATERMARK_REG);
qcom_geni_serial_setup_tx(uport, 1);
WARN_ON(!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
M_TX_FIFO_WATERMARK_EN, true));
writel_relaxed(c, uport->membase + SE_GENI_TX_FIFOn);
writel_relaxed(M_TX_FIFO_WATERMARK_EN, uport->membase +
SE_GENI_M_IRQ_CLEAR);
writel(c, uport->membase + SE_GENI_TX_FIFOn);
writel(M_TX_FIFO_WATERMARK_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
qcom_geni_serial_poll_tx_done(uport);
}
#endif
@ -386,7 +376,7 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport,
#ifdef CONFIG_SERIAL_QCOM_GENI_CONSOLE
static void qcom_geni_serial_wr_char(struct uart_port *uport, int ch)
{
writel_relaxed(ch, uport->membase + SE_GENI_TX_FIFOn);
writel(ch, uport->membase + SE_GENI_TX_FIFOn);
}
static void
@ -405,7 +395,7 @@ __qcom_geni_serial_console_write(struct uart_port *uport, const char *s,
bytes_to_send++;
}
writel_relaxed(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
qcom_geni_serial_setup_tx(uport, bytes_to_send);
for (i = 0; i < count; ) {
size_t chars_to_write = 0;
@ -423,7 +413,7 @@ __qcom_geni_serial_console_write(struct uart_port *uport, const char *s,
chars_to_write = min_t(size_t, count - i, avail / 2);
uart_console_write(uport, s + i, chars_to_write,
qcom_geni_serial_wr_char);
writel_relaxed(M_TX_FIFO_WATERMARK_EN, uport->membase +
writel(M_TX_FIFO_WATERMARK_EN, uport->membase +
SE_GENI_M_IRQ_CLEAR);
i += chars_to_write;
}
@ -452,7 +442,7 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s,
else
spin_lock_irqsave(&uport->lock, flags);
geni_status = readl_relaxed(uport->membase + SE_GENI_STATUS);
geni_status = readl(uport->membase + SE_GENI_STATUS);
/* Cancel the current write to log the fault */
if (!locked) {
@ -462,11 +452,10 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s,
geni_se_abort_m_cmd(&port->se);
qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
M_CMD_ABORT_EN, true);
writel_relaxed(M_CMD_ABORT_EN, uport->membase +
writel(M_CMD_ABORT_EN, uport->membase +
SE_GENI_M_IRQ_CLEAR);
}
writel_relaxed(M_CMD_CANCEL_EN, uport->membase +
SE_GENI_M_IRQ_CLEAR);
writel(M_CMD_CANCEL_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
} else if ((geni_status & M_GENI_CMD_ACTIVE) && !port->tx_remaining) {
/*
* It seems we can't interrupt existing transfers if all data
@ -475,9 +464,8 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s,
qcom_geni_serial_poll_tx_done(uport);
if (uart_circ_chars_pending(&uport->state->xmit)) {
irq_en = readl_relaxed(uport->membase +
SE_GENI_M_IRQ_EN);
writel_relaxed(irq_en | M_TX_FIFO_WATERMARK_EN,
irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
writel(irq_en | M_TX_FIFO_WATERMARK_EN,
uport->membase + SE_GENI_M_IRQ_EN);
}
}
@ -580,12 +568,12 @@ static void qcom_geni_serial_start_tx(struct uart_port *uport)
if (!qcom_geni_serial_tx_empty(uport))
return;
irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN);
irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
irq_en |= M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN;
writel_relaxed(port->tx_wm, uport->membase +
writel(port->tx_wm, uport->membase +
SE_GENI_TX_WATERMARK_REG);
writel_relaxed(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
}
}
@ -595,35 +583,28 @@ static void qcom_geni_serial_stop_tx(struct uart_port *uport)
u32 status;
struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN);
irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
irq_en &= ~M_CMD_DONE_EN;
if (port->xfer_mode == GENI_SE_FIFO) {
irq_en &= ~M_TX_FIFO_WATERMARK_EN;
writel_relaxed(0, uport->membase +
writel(0, uport->membase +
SE_GENI_TX_WATERMARK_REG);
}
writel_relaxed(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
status = readl_relaxed(uport->membase + SE_GENI_STATUS);
writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
status = readl(uport->membase + SE_GENI_STATUS);
/* Possible stop tx is called multiple times. */
if (!(status & M_GENI_CMD_ACTIVE))
return;
/*
* Ensure cancel command write is not re-ordered before checking
* the status of the Primary Sequencer.
*/
mb();
geni_se_cancel_m_cmd(&port->se);
if (!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
M_CMD_CANCEL_EN, true)) {
geni_se_abort_m_cmd(&port->se);
qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
M_CMD_ABORT_EN, true);
writel_relaxed(M_CMD_ABORT_EN, uport->membase +
SE_GENI_M_IRQ_CLEAR);
writel(M_CMD_ABORT_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
}
writel_relaxed(M_CMD_CANCEL_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
writel(M_CMD_CANCEL_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
}
static void qcom_geni_serial_start_rx(struct uart_port *uport)
@ -632,26 +613,20 @@ static void qcom_geni_serial_start_rx(struct uart_port *uport)
u32 status;
struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
status = readl_relaxed(uport->membase + SE_GENI_STATUS);
status = readl(uport->membase + SE_GENI_STATUS);
if (status & S_GENI_CMD_ACTIVE)
qcom_geni_serial_stop_rx(uport);
/*
* Ensure setup command write is not re-ordered before checking
* the status of the Secondary Sequencer.
*/
mb();
geni_se_setup_s_cmd(&port->se, UART_START_READ, 0);
if (port->xfer_mode == GENI_SE_FIFO) {
irq_en = readl_relaxed(uport->membase + SE_GENI_S_IRQ_EN);
irq_en = readl(uport->membase + SE_GENI_S_IRQ_EN);
irq_en |= S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN;
writel_relaxed(irq_en, uport->membase + SE_GENI_S_IRQ_EN);
writel(irq_en, uport->membase + SE_GENI_S_IRQ_EN);
irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN);
irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
irq_en |= M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN;
writel_relaxed(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
}
}
@ -663,31 +638,25 @@ static void qcom_geni_serial_stop_rx(struct uart_port *uport)
u32 irq_clear = S_CMD_DONE_EN;
if (port->xfer_mode == GENI_SE_FIFO) {
irq_en = readl_relaxed(uport->membase + SE_GENI_S_IRQ_EN);
irq_en = readl(uport->membase + SE_GENI_S_IRQ_EN);
irq_en &= ~(S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN);
writel_relaxed(irq_en, uport->membase + SE_GENI_S_IRQ_EN);
writel(irq_en, uport->membase + SE_GENI_S_IRQ_EN);
irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN);
irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
irq_en &= ~(M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
writel_relaxed(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
}
status = readl_relaxed(uport->membase + SE_GENI_STATUS);
status = readl(uport->membase + SE_GENI_STATUS);
/* Possible stop rx is called multiple times. */
if (!(status & S_GENI_CMD_ACTIVE))
return;
/*
* Ensure cancel command write is not re-ordered before checking
* the status of the Secondary Sequencer.
*/
mb();
geni_se_cancel_s_cmd(&port->se);
qcom_geni_serial_poll_bit(uport, SE_GENI_S_CMD_CTRL_REG,
S_GENI_CMD_CANCEL, false);
status = readl_relaxed(uport->membase + SE_GENI_STATUS);
writel_relaxed(irq_clear, uport->membase + SE_GENI_S_IRQ_CLEAR);
status = readl(uport->membase + SE_GENI_STATUS);
writel(irq_clear, uport->membase + SE_GENI_S_IRQ_CLEAR);
if (status & S_GENI_CMD_ACTIVE)
qcom_geni_serial_abort_rx(uport);
}
@ -701,7 +670,7 @@ static void qcom_geni_serial_handle_rx(struct uart_port *uport, bool drop)
u32 total_bytes;
struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
status = readl_relaxed(uport->membase + SE_GENI_RX_FIFO_STATUS);
status = readl(uport->membase + SE_GENI_RX_FIFO_STATUS);
word_cnt = status & RX_FIFO_WC_MSK;
last_word_partial = status & RX_LAST;
last_word_byte_cnt = (status & RX_LAST_BYTE_VALID_MSK) >>
@ -731,7 +700,7 @@ static void qcom_geni_serial_handle_tx(struct uart_port *uport, bool done,
unsigned int chunk;
int tail;
status = readl_relaxed(uport->membase + SE_GENI_TX_FIFO_STATUS);
status = readl(uport->membase + SE_GENI_TX_FIFO_STATUS);
/* Complete the current tx command before taking newly added data */
if (active)
@ -757,9 +726,9 @@ static void qcom_geni_serial_handle_tx(struct uart_port *uport, bool done,
qcom_geni_serial_setup_tx(uport, pending);
port->tx_remaining = pending;
irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN);
irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
if (!(irq_en & M_TX_FIFO_WATERMARK_EN))
writel_relaxed(irq_en | M_TX_FIFO_WATERMARK_EN,
writel(irq_en | M_TX_FIFO_WATERMARK_EN,
uport->membase + SE_GENI_M_IRQ_EN);
}
@ -790,14 +759,14 @@ static void qcom_geni_serial_handle_tx(struct uart_port *uport, bool done,
* cleared it in qcom_geni_serial_isr it will have already reasserted
* so we must clear it again here after our writes.
*/
writel_relaxed(M_TX_FIFO_WATERMARK_EN,
writel(M_TX_FIFO_WATERMARK_EN,
uport->membase + SE_GENI_M_IRQ_CLEAR);
out_write_wakeup:
if (!port->tx_remaining) {
irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN);
irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
if (irq_en & M_TX_FIFO_WATERMARK_EN)
writel_relaxed(irq_en & ~M_TX_FIFO_WATERMARK_EN,
writel(irq_en & ~M_TX_FIFO_WATERMARK_EN,
uport->membase + SE_GENI_M_IRQ_EN);
}
@ -821,12 +790,12 @@ static irqreturn_t qcom_geni_serial_isr(int isr, void *dev)
return IRQ_NONE;
spin_lock_irqsave(&uport->lock, flags);
m_irq_status = readl_relaxed(uport->membase + SE_GENI_M_IRQ_STATUS);
s_irq_status = readl_relaxed(uport->membase + SE_GENI_S_IRQ_STATUS);
geni_status = readl_relaxed(uport->membase + SE_GENI_STATUS);
m_irq_en = readl_relaxed(uport->membase + SE_GENI_M_IRQ_EN);
writel_relaxed(m_irq_status, uport->membase + SE_GENI_M_IRQ_CLEAR);
writel_relaxed(s_irq_status, uport->membase + SE_GENI_S_IRQ_CLEAR);
m_irq_status = readl(uport->membase + SE_GENI_M_IRQ_STATUS);
s_irq_status = readl(uport->membase + SE_GENI_S_IRQ_STATUS);
geni_status = readl(uport->membase + SE_GENI_STATUS);
m_irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
writel(m_irq_status, uport->membase + SE_GENI_M_IRQ_CLEAR);
writel(s_irq_status, uport->membase + SE_GENI_S_IRQ_CLEAR);
if (WARN_ON(m_irq_status & M_ILLEGAL_CMD_EN))
goto out_unlock;
@ -921,7 +890,7 @@ static int qcom_geni_serial_port_setup(struct uart_port *uport)
get_tx_fifo_size(port);
set_rfr_wm(port);
writel_relaxed(rxstale, uport->membase + SE_UART_RX_STALE_CNT);
writel(rxstale, uport->membase + SE_UART_RX_STALE_CNT);
/*
* Make an unconditional cancel on the main sequencer to reset
* it else we could end up in data loss scenarios.
@ -1025,10 +994,10 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
ser_clk_cfg |= clk_div << CLK_DIV_SHFT;
/* parity */
tx_trans_cfg = readl_relaxed(uport->membase + SE_UART_TX_TRANS_CFG);
tx_parity_cfg = readl_relaxed(uport->membase + SE_UART_TX_PARITY_CFG);
rx_trans_cfg = readl_relaxed(uport->membase + SE_UART_RX_TRANS_CFG);
rx_parity_cfg = readl_relaxed(uport->membase + SE_UART_RX_PARITY_CFG);
tx_trans_cfg = readl(uport->membase + SE_UART_TX_TRANS_CFG);
tx_parity_cfg = readl(uport->membase + SE_UART_TX_PARITY_CFG);
rx_trans_cfg = readl(uport->membase + SE_UART_RX_TRANS_CFG);
rx_parity_cfg = readl(uport->membase + SE_UART_RX_PARITY_CFG);
if (termios->c_cflag & PARENB) {
tx_trans_cfg |= UART_TX_PAR_EN;
rx_trans_cfg |= UART_RX_PAR_EN;
@ -1084,17 +1053,17 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
uart_update_timeout(uport, termios->c_cflag, baud);
if (!uart_console(uport))
writel_relaxed(port->loopback,
writel(port->loopback,
uport->membase + SE_UART_LOOPBACK_CFG);
writel_relaxed(tx_trans_cfg, uport->membase + SE_UART_TX_TRANS_CFG);
writel_relaxed(tx_parity_cfg, uport->membase + SE_UART_TX_PARITY_CFG);
writel_relaxed(rx_trans_cfg, uport->membase + SE_UART_RX_TRANS_CFG);
writel_relaxed(rx_parity_cfg, uport->membase + SE_UART_RX_PARITY_CFG);
writel_relaxed(bits_per_char, uport->membase + SE_UART_TX_WORD_LEN);
writel_relaxed(bits_per_char, uport->membase + SE_UART_RX_WORD_LEN);
writel_relaxed(stop_bit_len, uport->membase + SE_UART_TX_STOP_BIT_LEN);
writel_relaxed(ser_clk_cfg, uport->membase + GENI_SER_M_CLK_CFG);
writel_relaxed(ser_clk_cfg, uport->membase + GENI_SER_S_CLK_CFG);
writel(tx_trans_cfg, uport->membase + SE_UART_TX_TRANS_CFG);
writel(tx_parity_cfg, uport->membase + SE_UART_TX_PARITY_CFG);
writel(rx_trans_cfg, uport->membase + SE_UART_RX_TRANS_CFG);
writel(rx_parity_cfg, uport->membase + SE_UART_RX_PARITY_CFG);
writel(bits_per_char, uport->membase + SE_UART_TX_WORD_LEN);
writel(bits_per_char, uport->membase + SE_UART_RX_WORD_LEN);
writel(stop_bit_len, uport->membase + SE_UART_TX_STOP_BIT_LEN);
writel(ser_clk_cfg, uport->membase + GENI_SER_M_CLK_CFG);
writel(ser_clk_cfg, uport->membase + GENI_SER_S_CLK_CFG);
out_restart_rx:
qcom_geni_serial_start_rx(uport);
}
@ -1185,13 +1154,13 @@ static int __init qcom_geni_serial_earlycon_setup(struct earlycon_device *dev,
geni_se_init(&se, DEF_FIFO_DEPTH_WORDS / 2, DEF_FIFO_DEPTH_WORDS - 2);
geni_se_select_mode(&se, GENI_SE_FIFO);
writel_relaxed(tx_trans_cfg, uport->membase + SE_UART_TX_TRANS_CFG);
writel_relaxed(tx_parity_cfg, uport->membase + SE_UART_TX_PARITY_CFG);
writel_relaxed(rx_trans_cfg, uport->membase + SE_UART_RX_TRANS_CFG);
writel_relaxed(rx_parity_cfg, uport->membase + SE_UART_RX_PARITY_CFG);
writel_relaxed(bits_per_char, uport->membase + SE_UART_TX_WORD_LEN);
writel_relaxed(bits_per_char, uport->membase + SE_UART_RX_WORD_LEN);
writel_relaxed(stop_bit_len, uport->membase + SE_UART_TX_STOP_BIT_LEN);
writel(tx_trans_cfg, uport->membase + SE_UART_TX_TRANS_CFG);
writel(tx_parity_cfg, uport->membase + SE_UART_TX_PARITY_CFG);
writel(rx_trans_cfg, uport->membase + SE_UART_RX_TRANS_CFG);
writel(rx_parity_cfg, uport->membase + SE_UART_RX_PARITY_CFG);
writel(bits_per_char, uport->membase + SE_UART_TX_WORD_LEN);
writel(bits_per_char, uport->membase + SE_UART_RX_WORD_LEN);
writel(stop_bit_len, uport->membase + SE_UART_TX_STOP_BIT_LEN);
dev->con->write = qcom_geni_serial_earlycon_write;
dev->con->setup = NULL;